318 COMPOSIT ERIGERON 
single heads: leaves narrowly linear, elongated, entire, attenuate at the 
base, the lowermost tapering into a slender petiole: heads 5-6 lines in 
diameter : bracts of the involucre linear, very acute, densely hirsute: rays 
numerous, 6 lines long, white to purple. Arid plains between the Cascade 
and Rocky mountains, British Columbia to California ana New Mexico. 
++ ++ Tufted, stems very short and densely leafy, -bearing 
simple and monocephalous scapiform or few-leaved flowering stems: 
leaves narrowly spatulate-linear: heads large: rays 25-50 not very 
narrow, 3-4 lines long. 
E. Poliospermns Gray Syn. Fl. i, Pt. 2, 210. Soft-hispid throughout 
with white hairs: stems numerous, from a branched rootstock, an inch or 
less long, very leafy: leaves spatulate to lanceolate, 2-6 lines long, on 
slender petioles 1-2 inches long: scapose peduncle 2-4 inches long: heads 
half-inch or more in diameter: bracts of the involucre setaceous, densely 
‘hispidulous : rays 20-30, blue-violet to almost white: achenes densely 
white-vil'ous: outer pappus slender-squammellate, fully as long as the 
breadth of the achene covered by the copious white silky hairs of the 
Beene; On dry rocky ridges along the Columbia riv-r from The Dalles 
eastward. 
_E., Chrysopsidis Gray I. c. Chrysopsis hirtella DC. Hirsute with 
white spreading hairs, stems scape-like, leafy at the base, 2-4 inches high: 
leaves spatu ate, mostly obtuse, including the petiole 1-3 inches long, 
usually about a line wide at the summit: heads solitary, terminal: in- 
volucre open-companulate, its bracts narrow, numerous 3-5 lines long, 
hirsute: rays, 4)-50, golden yellow, 6-8 lines long: achenes barely pubes- 
cent or birsutulous: outer pappus merely setulose. On high stony ridges, 
Eastern Oregon in the John Dy country. 
+ + + Dwarf, cespitose from a multicipital candex, with 
monocephalous flowering stems, often scapose : radical leaves dissected : 
pappus simple. 
E. compositus Pu'sh Fl. ii, 535. Herbage hirsute to glabrate and 
more or less viscidulous: stems very short, from a somewhat woody creep- 
ing base, densely leafy : leaves fan-shaped in outline, usually 1-3-ternately 
parted into linear or short and narrow spatulate lobes, 2-6 lines long, on 
jong slender hispid-ciliate petio'es; the few on the erect flowing stems 3- 
lobed, or entire and linear: involucre 3-4 lines high, sparsely hirsute: rays 
40-60 not very narrow, white purple or violet mostly 3-4 lines long. On 
cliffs, Artic seacoast, Greenland, and Spitzbergen to the higher moun- 
tains of Washington, Oregon and California and the Rocky mountains. 
Var. discoideus Gray, Am. Jour Sci. Ser. 2, xxxi'i, 237. Rays want- 
ing or abortive: heads commonly smaller. Some range as the radiate 
form, often growing with it. 
+ + + + Dwarf or low species, alpine or alpestine, entire- 
leaved, cespitose from multicipital caudex, no fine or cinereous 
pubescence, monocephalous: leaves few on the simple stem at least 
the radical broader than linear: rays rather numerous and not very 
narrow : pappus simple or nearly so. 
++ Involucre hirsute or pubescent, greenish: herbage not strigulose 
nor cinereous. 
E. radicatus Hook. Fl. ii, 17. ‘‘A span high or less, densely tufted: 
leaves all spatulate-linear or somewhat wider (broadest only a line or two 
wide), hirsute or hirsutely ciliate, or sometimes almost naked, then 
glabrous; no glandular roughness: inyolucre more or less villous-pubes- 
cent (barely 3 lines high): rays white or purplish, 2 or 3 lines long.” Al- 
